add sticky footer contentview

web/src/css/contentview.less

@@ -11,4 +11,7 @@
     .text{
 
     }
+    .codeeditor{
+        margin-bottom: 12px;
+    }
 }

web/src/css/flowdetail.less

@@ -6,6 +6,8 @@
 .flow-detail {
     width: 100%;
     overflow:hidden;
+    display: flex;
+    flex-direction: column;
 
     nav {
         background-color: #F2F2F2;
@@ -44,18 +46,14 @@
     display: flex;
     flex-direction: column;
     padding: 0 !important;
-    height:95%;
 }
 
 .flowview-body{
-    position:relative;
-    flex: 1 1 auto;
     overflow: auto;
     padding: 5px 12px 0;
 }
 
 .flowview-footer{
-    flex: 0 0 auto;
     box-shadow: 0 0 3px gray;
     padding: 2px;
     margin: 0;

web/src/js/components/ContentView/CodeEditor.jsx

@@ -14,7 +14,7 @@ export default function CodeEditor ( { content, onChange} ){
         lineNumbers: true
     };
     return (
-        <div onKeyDown={e => e.stopPropagation()}>
+        <div className="codeeditor" onKeyDown={e => e.stopPropagation()}>
             <Codemirror value={content} onChange={onChange} options={options}/>
         </div>
     )